Read "The Free Lunch is Over Article" to answer the following questions. This article is on Canvas Introductory papers. Also it is available online here.

Link to the article: http:$//$www$.$gotw.ca$/$publications$/$concurrency$-$ddj$.$htm

Q$1.$ Why Herb Sutter does not think highly about hyperthreading feature in CPUs?

Q$2.$ What does Herb Sutter want to explain when he says $$Cache is king$?$

Q$3.$ What are the problems with concurrent code as mentioned in the article?

Q$4.$ Why is a quad$-$core processor not four times as fast as a single core system?